One of our fellow stangnet members, Stan Weiss, has a really cool website for you gearheads, and non gearheads like myself. I'm sure some of you have checked it out, but I thought I would share it for some of you that havent seen it.
http://users.erols.com/srweiss/index.html#jcalc
http://users.erols.com/srweiss/index.html#jcalc